…6819)

Adds a verticalAnnotation property to GraphWidget, reference: https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/CloudWatch-Dashboard-Body-Structure.html#CloudWatch-Dashboard-Properties-Annotation-Format

Shoutout to brendo-m for coming up with the solution

Closes #7622.

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

This PR added support for start and end time of the schedule.

## Description
Currently, users cannot set a start time and an end time for the schedule.
A schedule without a start date will begin as soon as it is created and available, and without an end date, it will continue to invoke its target indefinitely.
With this feature, users can set the start and end dates of a schedule, allowing for more flexible schedule configurations.
https://docs.aws.amazon.com/ja_jp/AWSCloudFormation/latest/UserGuide/aws-resource-scheduler-schedule.html#cfn-scheduler-schedule-startdate
https://docs.aws.amazon.com/ja_jp/AWSCloudFormation/latest/UserGuide/aws-resource-scheduler-schedule.html#cfn-scheduler-schedule-enddate

In CloudFormation, users can use this feature as follows:
```yaml
  TestSchedule:
    Type: AWS::Scheduler::Schedule
    Properties: 
      StartDate: "2024-12-01T13:09:00.000Z"
      EndDate: "2025-12-01T00:00:00.001Z"
      ScheduleExpression: "at(2023-01-01T00:00:00)"
      State: "ENABLED"
      Target: # target
```

## Major changes
### add property to ScheduleProps interface
Added startDate and endDate properties, and typed these values as string based on the following PR comments.
#26819 (comment)

It is not necessary to specify both startDate and endDate, they can be set independently.
Validation is performed on the following points.
- Error if not following ISO 8601 format.
  - Must include milliseconds (yyyy-MM-ddTHH:mm:ss.SSSZ)
- Error if startDate is later than endDate

If a time before the current time is specified, the following error occurs in CFn, but no validation is performed because the timing of validation in CDK and the timing of actual deployment are different.
`The StartDate you specify cannot be earlier than 5 minutes ago.`

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*